Stereolithography is an important rapid prototyping process that creates three-dimensional solid objects in a multi-layer procedure. This technology involves the curing or solidification of a liquid photo or thermo sensitive polymer through the use of an irradiation light source, which supplies the energy needed to induce a chemical reaction, bonding large numbers of small molecules and forming a highly cross-linked polymer. This reaction determines the resin morphology that, in turn, defines the physical, electrical, and mechanical properties of the cured material. The cure reaction is highly exothermic and, the temperature and the reaction rate can vary considerably within the curing material due to polymers low thermal conductivity. The main goal of this thesis is to study the process of microstereolithography by infrared radiation and the corresponding polymeric systems. Thermal effects were used over an appropriated polymeric resin to induce a phase change in the material, known as cure reaction, and consequently to obtain solid shapes or patterns. Cure kinetics was characterised and the effects of resin composition were determined. The knowledge of parameters and material composition influence over the process is of great importance to predict both the final geometry and mechanical properties.